From: khilman@linaro•org (Kevin Hilman)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 06/18] ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains
Date: Wed, 03 Apr 2013 13:31:37 -0700 [thread overview]
Message-ID: <87k3ojuziu.fsf@linaro.org> (raw)
In-Reply-To: <1364205910-32392-7-git-send-email-santosh.shilimkar@ti.com> (Santosh Shilimkar's message of "Mon, 25 Mar 2013 15:34:58 +0530")
Santosh Shilimkar <santosh.shilimkar@ti•com> writes:
> In addition to the standard power-management technique, the OMAP5
> MPU subsystem also employs an SR3-APG (mercury) power management
> technology to reduce leakage.
>
> It allows for full logic and memories retention on MPU_C0 and MPU_C1 and
> is controlled by the PRCM_MPU.
>
> Acked-by: Nishanth Menon <nm@ti•com>
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti•com>
> ---
> arch/arm/mach-omap2/omap-mpuss-lowpower.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
> index b1441b1..d390d18 100644
> --- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c
> +++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
> @@ -62,6 +62,10 @@
> #include "prm44xx.h"
> #include "prm-regbits-44xx.h"
>
> +/* Add defines needed for mercury mode. Refer MPU's PRM_PSCON_COUNT */
> +#define PRM_PSCON_HG_EN (1 << 24)
> +#define PRM_PSCON_HG_RAMPUP (1 << 25)
nit: use BIT()
> #ifdef CONFIG_SMP
>
> struct omap4_cpu_pm_info {
> @@ -337,6 +341,28 @@ int __cpuinit omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
> return 0;
> }
>
> +/**
> + * enable_mercury_retention_mode: Enable OMAP5 mercury retention feature
> + *
> + * OMAP5 devices supports SR3-APG (mercury) power management technology to
> + * reduce leakage. It allows for full logic and memories retention on
> + * MPU_C0 and MPU_C1 and is controlled by the PRCM_MPU. The function enable
> + * the mercury retention feature.
> + */
> +static void enable_mercury_retention_mode(void)
__init ?
This is very OMAP5 specific (unless you generalize the offsets used) so
should this have omap5_ prefix?
Kevin
> +{
> + u32 reg;
> +
> + /*
> + * To enable mercury mode, both HG_EN and HG_RAMPUP needs to be
> + * enabled from PRM_PSCON_COUNT register.
> + */
> + reg = omap4_prcm_mpu_read_inst_reg(OMAP54XX_PRCM_MPU_DEVICE_INST,
> + OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET);
> + reg |= PRM_PSCON_HG_EN | PRM_PSCON_HG_RAMPUP;
> + omap4_prcm_mpu_write_inst_reg(reg, OMAP54XX_PRCM_MPU_DEVICE_INST,
> + OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET);
nit: when I see 'reg', I expect it to be a register/offset. But this is
a register value. Maybe use 'val' instead as you've done elsewhere in
this series.
Kevin
> +}
>
> /*
> * Initialise OMAP4 MPUSS
> @@ -415,6 +441,7 @@ int __init omap4_mpuss_init(void)
> cpu_context_offset = OMAP4_RM_CPU0_CPU0_CONTEXT_OFFSET;
> } else if (soc_is_omap54xx()) {
> cpu_context_offset = OMAP54XX_RM_CPU0_CPU0_CONTEXT_OFFSET;
> + enable_mercury_retention_mode();
> }
>
> return 0;
next prev parent reply other threads:[~2013-04-03 20:31 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-25 10:04 [PATCH v2 00/18] ARM: OMAP5: PM: Add MPUSS suspend and CPUidle support Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 01/18] ARM: OMAP4+: PM: Consolidate MPU subsystem PM code for re-use Santosh Shilimkar
2013-04-03 19:44 ` Kevin Hilman
2013-04-04 11:32 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 02/18] ARM: OMAP5: PM: Update CPU context register offset Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 03/18] ARM: OMAP4+: PM: Consolidate and use OMAP4 PM code for OMAP5 Santosh Shilimkar
2013-04-03 20:20 ` Kevin Hilman
2013-04-04 11:51 ` Santosh Shilimkar
2013-04-04 11:55 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 04/18] ARM: OMAP5: PM: Set MPUSS-EMIF clock-domain static dependency Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 05/18] ARM: OMAP5: PM: Enables ES2 PM mode by default Santosh Shilimkar
2013-04-03 20:25 ` Kevin Hilman
2013-04-04 12:02 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 06/18] ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains Santosh Shilimkar
2013-04-03 20:31 ` Kevin Hilman [this message]
2013-04-04 12:08 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 07/18] ARM: OMAP5: Add init_late() hook to enable pm initialization Santosh Shilimkar
2013-04-03 20:33 ` Kevin Hilman
2013-04-04 12:28 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 08/18] ARM: OMAP5: PM: Add CPU power off in hotplug path Santosh Shilimkar
2013-04-03 20:49 ` Kevin Hilman
2013-04-04 13:23 ` Santosh Shilimkar
2013-04-04 17:31 ` Kevin Hilman
2013-04-05 9:04 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 09/18] ARM: OMAP4+: PM: Restore CPU power state to ON with clockdomain force wakeup method Santosh Shilimkar
2013-04-03 20:54 ` Kevin Hilman
2013-04-04 13:37 ` Santosh Shilimkar
2013-04-04 17:42 ` Kevin Hilman
2013-04-05 9:07 ` Santosh Shilimkar
2013-04-05 11:58 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 10/18] ARM: OMAP5: PM: Add MPU Open Switch Retention support Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 11/18] ARM: OMAP5: PM: Add L2 memory power down support Santosh Shilimkar
2013-04-03 20:58 ` Kevin Hilman
2013-04-04 13:46 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 12/18] ARM: OMAP4: CPUidle: Avoid double idle driver registration Santosh Shilimkar
2013-04-03 21:03 ` Kevin Hilman
2013-04-04 13:47 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 13/18] ARM: OMAP: CPUidle: Unregister drivere on device registration failure Santosh Shilimkar
2013-04-03 21:03 ` Kevin Hilman
2013-04-04 13:48 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 14/18] ARM: OMAP4: CPUidle: Make C-state description field more precise Santosh Shilimkar
2013-04-03 21:05 ` Kevin Hilman
2013-04-04 13:48 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 15/18] ARM: OMAP4+: CPUidle: Consolidate idle driver for OMAP5 support Santosh Shilimkar
2013-04-03 21:10 ` Kevin Hilman
2013-04-04 14:04 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 16/18] ARM: OMAP4+: CPUidle: Deprecate use of omap4_mpuss_read_prev_context_state() Santosh Shilimkar
2013-04-03 21:37 ` Kevin Hilman
2013-04-04 13:59 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 17/18] ARM: OMAP4+: CPUidle: Add OMAP5 idle driver support Santosh Shilimkar
2013-04-03 21:25 ` Kevin Hilman
2013-04-04 14:16 ` Santosh Shilimkar
2013-04-04 17:55 ` Kevin Hilman
2013-04-05 9:41 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 18/18] ARM: OMAP5: PM: handle device instance for warm reset Santosh Shilimkar
2013-03-25 11:46 ` [PATCH v2 00/18] ARM: OMAP5: PM: Add MPUSS suspend and CPUidle support Lokesh Vutla
2013-03-25 12:10 ` Santosh Shilimkar
2013-03-25 12:27 ` Sourav Poddar
2013-03-25 12:47 ` Rajendra Nayak
2013-03-25 13:00 ` Sourav Poddar
2013-04-03 22:52 ` Kevin Hilman
2013-04-04 14:34 ` Santosh Shilimkar
2013-04-04 16:49 ` Santosh Shilimkar
2013-04-04 17:57 ` Kevin Hilman
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